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The Argentine, 28, lost his place in February to Gabriel Jesus, leading to speculation he might leave this summer.
"I've read a lot of the speculation on this and it's ridiculous," Al Mubarak said. "He is one of the best players in the world. He is an absolute must."
Aguero scored 33 goals in 45 games this season and is contracted until 2020. He said in March he did not want to leave.
In a wide-ranging interview, Al Mubarak also told the City website:
BBC Sport's Simon Stone:
Al Mubarak could not be any more firm in his comments about Aguero. Yet, there is an obvious truth that has to be taken into account.
City already have Gabriel Jesus who can play centrally. In addition, they have Leroy Sane, Raheem Sterling and new signing Bernardo Silva and Kevin de Bruyne who can play wide. In addition, while rumours about trying to sign Alexis Sanchez remain just that, Pep Guardiola clearly likes the Chilean.
So, if Sanchez did come, and Aguero. did stay, Guardiola would have his work cut out trying to keep everyone happy.
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Manager Pep Guardiola's debut season ended with Manchester City finishing third in the Premier League and sealing a place in next season's Champions League.
But the 46-year-old, who succeeded Manuel Pellegrini last summer after success-packed spells at Barcelona and Bayern Munich, could not help his side challenge for the title and they faced a tense battle to even finish in the top four.
Despite ending the season without a trophy, chairman Al Mubarak said their season was "not a disappointment".
"We are team now that expects to win every year at least one trophy and go further every year in the Champions League," he said.
"But, if you look at it from a different lens, we are truly going in a direction that is positive.
"Pep has introduced a new way of playing for us, an exciting way but a way that requires work and which requires a set of players that I think function within that system.
"Probably, if I look back at this season that puzzle wasn't complete and I hope this summer we support Pep in completing that puzzle."
Man City have already announced the signing of Portugal attacking midfielder Bernardo Silva from French champions Monaco, and are close to adding Benfica goalkeeper Ederson Moraes to their ranks.
Goalkeeper Joe Hart has confirmed he will be returning to Manchester City from his season-long loan at Torino, but is expected to leave City for good this summer.
Goalkeeper Willy Caballero, winger Jesus Navas and full-backs Gael Clichy and Bacary Sagna are also all departing the Manchester club.
And chairman Al Mubarak said there are clearly positions that they need to fill in the summer transfer window.
"You can see the players that are exiting right now, and that will give a clear indication of the positions that are a high priority for us to fill - full-backs both on the right and the left," he said.
"Pep relies heavily on that position and we know exactly what Pep wants.
"You should expect us to bring in a goalkeeper. We've done a lot of work on this area and our target has been set. Hopefully you'll be hearing soon what we're going to be doing in that area."
Pablo Zabaleta: "For me, he represents the essence of Manchester city - a fighter. He is someone special and if we can have 25 Pablos in our squad we would win it all. I think he still plans on playing for a couple of years - but once he hangs his boots up he will come back in some capacity."
David Silva: "He is one of the most talented players in the world and it truly baffles me. How he could be so underrated in the UK is an enigma to me. He is well respected everywhere in the world but somehow always misses out on the big awards in the UK. It's ridiculous frankly."
Yaya Toure: "He has shown us this year again and again how he can contribute to this team. Pep, as you have seen obviously this year, has a lot of trust and confidence in him. So I hope Yaya will be with us and continue his journey with us."
Leroy Sane: "He's the right age, the right talent, one of the most exciting prospects in Europe, and he's shown that on the pitch this year."
John Stones: "He is going to be one of the best central defenders in the world, I have no doubt about that. A top, top player."
Gabriel Jesus: "He is 19, one of the top future talents in the world."
Vincent Kompany: "I am absolutely delighted the way he ended the season. It's been an extremely difficult journey for him. It's not been easy watching the rest of the team play and having to deal with some of the injuries he's had. But he's dealt with it."
Manchester City striker Sergio Aguero's future has "never been in doubt", chairman Khaldoon Al Mubarak says.

And with that in mind, the Northern Ireland Pensioners' Parliament has drawn up a manifesto of what its members feel are the key issues for them.
Their eight-point paper touches on a number of concerns that older people have, including energy costs, age discrimination, prescription charges and public transport.
Anne Watson, a member of the Pensioners' Parliament said that withdrawing free Smartpass travelcards for older people would have a knock-on effect on the health service.
She issued a warning to those who will be returned to Stormont after the election: Hands off our bus passes.
"They think they have problems as far as health is concerned now - they ain't seen anything yet if they take the Smartpass away," she said.
"If older people can't get out, they're going to be sitting in the house, feeling sorry for themselves because they couldn't afford the bus fares.
"They'll be finding medical problems they never knew they had."
Margaret Galloway said free transport was "vitally important" to senior citizens in keeping them active and enabling them to visit their children and babysit grandchildren.
And Francis Hughes said older people needed more credit for their contribution to saving on childcare costs in Northern Ireland.
"We've heard about the bank of mum and dad - there's the bank of grandparents as well," he said.
"Grandparents are making huge contributions, which are not recognised."
It's one of the murky inevitabilities of election campaigns - posters are pinched from lampposts, hoardings are hauled away from roadsides and some are defaced and ditched.
Whether it's done for political gain or just out of badness is anyone's guess.
But after four of his hoardings went missing from where they'd been placed in Armagh, the SDLP's Justin McNulty has taken a novel approach to tackling the culprits.
In a wild west-style post on Twitter, he challenges those who moved his promotional material to join his canvassing team.
"If you like my poster so much," he said, "come and lend a hand with our campaign."
Could this be the first sign that Sinn FÃ©in's vote is set to slide in this election?
Veteran republican Fra McCann took his election campaign to the children's playpark in Belfast's Dunville Park for a party event along with party president Gerry Adams.
And even though he's running in his 18th election, he's clearly still fit for some fun and games along the way.
A west Belfast community worker has said this election "feels different" as people are "screaming out" against the status quo at Stormont.
Speaking at an event looking at the impact of Brexit in West Belfast on Tuesday, Tommy Holland said he believed politicians "might get a slap on the wrists".
He has been working in the community for 37 years, now with the Upper Springfield Development Trust, and said he "feels hopeful" of change at the ballot box.
"We need to get away from that whole past that we went through," he said.
"People want it to be different - it has to be different.
"This is what I'm hearing on the ground in the community and voluntary sector and talking to the friends, the neighbours, the family.
"I hope that people don't get apathy, I hope that people do come out in their droves and I hope they vote to ensure that there's proper government."
BBC News NI's Campaign Catch-up will keep you across the Northern Ireland Assembly election trail with a daily dose of the main stories, the minor ones and the lighter moments in the run up to polling day on Thursday 2 March.
Hear more on BBC Radio Ulster's Good Morning Ulster and BBC Radio Foyle's The Breakfast Show at 07:40 GMT, and on BBC Radio Ulster's Evening Extra at 17:40 each weekday.
With Northern Ireland's population aging, older voters will undoubtedly have an important say in the outcome of the assembly election on 2 March.

A redrafted version of the plan will be published on Monday and debated for two days next week, Mr Grayling said.
He would then "publish and table a final set of standing orders" which MPs would debate after the summer recess.
Labour said the "reckless and shoddy" plans had descended into "chaos" while the SNP said it was a "shambles"
The government believes bills applying exclusively to England should not become law without the explicit consent of MPs from English constituencies and it wants to change Commons rules known as standing orders to give them a "decisive say" during their passage.
The plan had been for a new Commons stage to be introduced for laws passing through Parliament with England's MPs asked to accept or veto legislation only affecting England before it passes to a vote of all UK MPs at third reading.
Ministers say this will address the longstanding anomaly by which Scottish MPs can vote on issues such as health and education affecting England but English MPs have no say on similar matters relating to Scotland, where such policies are devolved.
A similar process would be used, including Welsh MPs, where matters covered only England and Wales.
However, the plans came under sustained attack earlier this week from Labour, SNP and Lib Dem MPs in an urgent debate, secured by former Scottish Secretary Alistair Carmichael.
The debate also revealed concerns among some Conservative MPs, which could have threatened a government defeat on the measures.
Shadow Commons leader Angela Eagle said the Commons schedule had been "clearly subject to last-minute, sudden change" and said the "shoddy" plans had "descended into chaos".
She claimed Mr Grayling had been "summoned to the prime minister's office to account for your role in creating this mess".
Mr Grayling said the changes were the result of having "listened to comments from MPs".
A senior government source said the modified proposals were technical changes aimed at clarifying how the new process would work, in particular in relation to measures which might not cover Scotland but which had knock-on effects on its funding via the Barnett formula.
The source said: "It's not a rewrite in any shape or form."
The prime minister's official spokeswoman said that David Cameron had discussed the matter with Mr Grayling and the delay "respected the parliamentary process".
She added that the "policy hasn't changed" and ministers remained committed to delivering it so that every part of the UK had a say on matters relating to them.
But the SNP's Pete Wishart said the government was in "headlong retreat" on the issue.
"What this farce underlines is how weak the Tory government is with its wafer-thin majority, and how strong opposition can force them to change course," he added.

Commons leader Chris Grayling says the government is clarifying its plans to give England's MPs a veto over English laws, with a vote delayed to September.

